Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a3892a056a44c6…

MALICIOUS

PDF

67.9 KB Created: 2021-10-03 03:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9070de270116eb0333588780771768f7 SHA-1: a0680f152feb51806e5c23c4902ac8a77615ba15 SHA-256: 80a3892a056a44c68de823727a085d5d8a0efad807931665c92aaa3c8bff50e4
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. Heuristics indicate it functions as a link farm, likely to distribute malicious content or phish users. The embedded JavaScript is a common method for executing exploits or downloading further payloads, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5726

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=energy+transfer+in+ecosystems+worksheet PDF link annotation
    • http://rancholasmonturaspremios.com/campannas/file/36236336857.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/vizavufuwejovogaweduzisum.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/gedivitodel.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/narifetitosagimebube.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/tosoxasopixuxeboxafununov.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/fatonefufusekuwumakeku.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/fujevupuwavig.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/pokoriwebezomomelaxuwugas.pdfIn PDF document text
    • http://stefani.cz/fck/file/35643824542.pdfIn PDF document text
    • http://khocabien.com/uploads/files/kafarulanazuwubuxefufofi.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613af78fa71c4---28752212828.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16150f22b07f8f---nimosefav.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/vuvefazanutito.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/86058934623.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qakvt08g1kmhu47vcbgqo58oe/gomepateluwirodanap.pdfIn PDF document text
    • https://securincasso-online.nl/ckfinder/userfiles/files/raripajegogedu.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202192221810645.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16152f31ccae78---radabakubuvus.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/dakaxe.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/zukadexi.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/22570788070.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/gozasarofunutulawoma.pdfIn PDF document text
    • https://vitanov.rs/files/27427106802.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E7 11012 bytes
SHA-256: 3999b92c190bae3e6dd3450bdeca825997fdd4d99dca8b3e76762cc8ea9e1a17
font_01_sfnt_off0000cd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD69 17176 bytes
SHA-256: 6c4e313ce7151049d2ab135c7f728be86c979556966d8361ea465d3ed7fcee6d
font_02_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1